Diaphragm pump



P 1953 R. 'r. CORNELIUS 2,650,545

DIAPHRAGM PUMP Filed Dec. 2, 1949 I s Sheets-She et 1 I6 I I6 3mm F G l RICHARD T. CORNELIUS fimawpgm ATTORNEYS Sept. 1, 1953 R. T. CORNELIUS DIAPHRAGM PUMP s Sheets-Sheet 2 Filed Dec. 2, 1949 awe/WM RICHARD T. CORNELIUS ATTORNEYS Sept. 1, 1953 R. T. CORNELIUS DIAPHRAGM PUMP 3 Sheets-Sheet 3 Filed Dec. 2, 1949 3mm RICHARD T. CORNELIUS ATTORNEYS Patented Sept. 1, 1953 UNI TED STATE-5 2,650,545

IA M E B M liiphasdm Qcm wnss ec isli ice- ApplicationlDecember 2, 19,49, SeriatNo- 139 7 6? 2 Cla ms. (c -snlt liee nflll My invention relates .561 diaphrasm. pumps; a

:has for an objecttoproduce, autumn hav n 12. 7% capacity for its size and weight.

Another object of the invention resides in pl qriding a diaphragm pump: which will be extremely compact in form.

A still further object of the invention res-ides in providing a diaphragm pump whi h. 1 be constructed with a minimum amount oijnachining-.

An object ofthe invention resides in constructling the pump with a. bodyzformed of molded Plastic material and. a head overlying said: body and similarly constructed.

A feature of the invention resides in providin the body witha lateral twall structureland in further providing a partition. in the body extending across the wall structure and dividing the interiorlbodyinto two compartments elongated in form and in further constructingthe-said wall structure and partition with curved Aends-toform the. compartments. .ov-ular in cross section.

An object of the invention resides in providing "ovular pistons mounted in vsaidoompartments wand in employing a singlesheet oi flexihlematerrial disposed hetween said headand body and forming a (diaphragm for said pistons and ,a

gasket between said head and body.

:A still furtherlobject of the invention'resides in providing a cap resting upon the .uppeniend of the headland a base supporting the; body; both said capand .base heing constructed 9.1? cast -.metal and in further providing-bolts engaging said cap and-baseand clampin the. pa ts oeethcn in s -duce undue strain on the molde plesti head and-body.

lran ms sa d. crank shaft at right angles; tosaid partition and to t e ma or axes of "sa d nistcnsstill nfiurih r objec of th invent on resides in nema vesin-said heed. one pair for each nist and in ersenginese d e vest ove liesaid ,p tcnsrthe yelves at each, ai heir; l is eseda :cppo itc ends of the Pist n t hiph'ethey 199xesp nd, the v lve atvon nd ca pi; thesiston e ng inlet-.walwsand a the eme -end being outlet valves.

1 Other bjects of th inveetipn r esi ie th n cembine icnend rra s enter nertsand in thedeta l ime t setiqm t trated, nd/or described! In the drawin s I have Shawn ls iephr sm- 'tc't ib e iib f i.

5 t head embeds-.-

e iatessrij se his lcenfieete iea ee a 11 umei iil i i v r I taken 9. use rc Fi -3 and w -s ty e sl p ii i is ay i ada t d, to: pu ppin t n ends e li ui T i m cons t bodyew,,,.rv a partition dividing he t riq 6 th maxi-s im elen e cd Compartments..-

ell-simme s an e ie em u s to $11 thecon p tinents ovularin 'ss section Ineach ct the amns ms ri ntw di ees s s on o a m n rif m ac' i @b figu iop dco'mp mer ts; '0 erl .1 1 pins a H ,n end-bassist si gle-sheet o flex e mater a w h' lqtm d aleh esme ime i e ie and M iled eiw e in a hessie'reiq a i and outlet valves for each piston and which calv s r a ran ed, at he ends ft e s o .:,Bs h.l. he bc mii i eda -Q ed oi de elasti m ter al i "have? m iz n cing flexing of the diaphragm and without the req iremen c ma hi n he ma i h amounted an at, was q ees iiietal Qter in the head .5 I Ie ees i d' ca t meta as the W a i B s Carri d b he as P y whe a crank ht a 1 ,A heei r ft f action.

. n th dra n s:

1 is se -iieec i w o ed ephta m g anem odiment of the in t meter t dr ic fihe l Same ill t e Fig: ,2 l le eti nal se u m v ew ken s bs antially. in a d 9f a Fig. 3 is 'an evational sectional view taken substantially on line'3 '3 of Fig.1;

In the manufacture of diaphragm pumps the common procedure has been-to construct the parts of-metal and tofaccurately machine the 45 parts. to produce the desired contoursand for-m.

Tolsimnliiy machining, cir ular pistonsanddiap iragms ave een em o ed wh c equir an- P is s aseaedeiyea min m mam-Qun 9 4.- 1 91mm th no bilfm M c at ia hra m! newness cr re mr t 155 in this application for patent by utilizinga mold- 3 ed plastic head and body in which the surfaces can be made irregular and accurately molded to the desired configuration and form and with extreme smoothness thereby completely eliminating the necessity of machining the irregular parts.

The invention proper consists of a diaphragmtype pump H) which is mounted on a subbase I A motor l2, also mounted on the said subbase, serves to drive the pump. It will, however, be comprehended that the pump may be otherwise mounted and may be driven by any suitable source of motive power.

The subbase I! is preferably constructed of sheet metal having a platform l3 with a lateral wall structure l4 extending downwardly therefrom. The lowermost portion of this wall structure is formed with an outwardly extending flange |5 which is adapted to rest on the surface von which the pump is to be mounted and through which suitable bolts or lag screws [6 may be inserted to clamp the base in position. The platform |3 has a depression I1 in the same which serves to collect any oil leaking from the pump proper and to discharge the same through the base through an opening H3 in said depression.

The motor l2 may be of any standard construction and description of the same will not be given in detail. This motor consists of a 'housing l9 and to which a base is attached. Bolts 2| extending through said base and through the platform |3 of subbase |l serve to attach the motor to' the subbase. The motor has an armature shaft 22 which carries a sheave 23 and substantially rectangular in form to provide end walls and 3| and side walls 32 and 33. These walls are constructed with spaced sections 34 and 35 which are connected together at their upper ends by means of webs 36. This type of construction reduces the amount of material required and at t'he same time gives an upper surface 31 to the wall structure of appreciable width.- By means ofthis construction the resistance of the wall structure to compressive force is greatly increased. Extending transversely between the walls 32 and 33 is a transverse partition 38. This partition is similarly constructed with sections 39 and 40 and with a web 4| connecting the same together at their upper ends. The surface 42 of this web lies in continuation of the surface 3? of the wall structure 29 and the said surfaces lie in a common plane. By means of the construction provided two elongated compartments 43 and 44 are formed in the body 25 and which extend transversely of the same. The wall structure 29 and the partition 38 are curved at the ends of these compartments to give the said compartments an ovular cross section. The corners of the partition 38 and the wall structure 29 bounding the compartments 43 and 44 are rounded as indicated at 45. The entire body 26 is constructed from a molded plastic material which forms the surfaces 31' and 42 accurately and smoothly and which gives a rounded contour to the edges of the wall structure and partition bounding the compartments 43 and 44. I r v 4 The base 25 is constructed of cast metal which may be cast iron or aluminum as found desirable. This base has a wall structure 46 corresponding in shape to the wall structure 29 of body 26 and which has end walls 41 and 4B and side walls 49 and 50. The upper edge of the wall structure 46 structure 29 of body 23. This wall structure has end walls 55 and 56 and side walls 51 and 58. The said head further has an inner wall structure 59 which conforms to the inner sections 34 of wall structure 29 and to the sections 39 and 40 of partition 38 of body 26 and which is connected to the outer wall structure by means of webs60.

These webs have a surface 6| which faces the surfaces 31 and 42 of the body 26. The upper 'end of the wall structure 54 has a surface 62 faces 31 and '42 is a sheet 63 of flexible material such as rubber or the like. This sheet is clamped in position betweensaid surfaces as will be presently explained. Extending outwardly from the surfaces 6|, 37 and 42 are beads 64 which bite into the rubber and hold the same in place and also assist in preventing leakage along the said surfaces.

V Overlying the head 55 is the cap28. This cap is dome-shaped in form having a top 65 and a circular wall structure 66. The wall structure 66 of the cap 28 is more nearly circular as shown in Fig. 1 as compared to the rectangular form of the wall structure 54 of head 21. At the corners between the said two parts are formed flanges 69. The lower end of the wall structure 66 and the flanges 69 have a surface 61 which corresponds with the surface 62 of head 21 and which facesthe surfaces 62. A gasket 68 is disposed between these surfaces and forms a tight joint therebetween. Cap screws 10 extend through these flanges, through bosses 1| formed in the corners of the head 21 and through similar bosses 12 formed'at the corners of the body 26. These 'ings' l5 and 16 which are fitted into bores 11 in bosses 18 formed in the end walls 41 and 48 of the wall structure 46. Washers |29 overlie the edges of these bearings to restrain outward movement of the bearings and are held in position by means of screws I30 screwed into the bosses 18.

The crank shaft 14 has a shaft extension I9 on which is mounted a fly wheel 88. This fly wheel 'is formed with a groove 8| which serves as a sheave and about which the V-belt24 leading from motor l2 extends. By means of this construction the said crank shaft 14 is driven. The

blank shaft 14 has two cranks 82 and 83 which are arranged so that the throw of the same is degrees out of phase. Mounted on these cranks. are two connecting, rods-stand. 85. The connecting. rod 94 isv disposed in: compartment. 43 while: the connecting? rod. 85 is disposed. in the compartment 44'. The said connectingrodshave mountediin them ball bearings. 89. and 8.1 which inturn are-mountedzon-the'cranks-'82 and. 83. The connecting; rods B4= and are formed integral with pist'onsw88: and-89iwhich are ovular inform andiwh-i'ch conform to i the shape of the compartments- 43 and 44; These.- pistons. havecurved surfaces 9 which areadapted to engage the. sheet 63' of; flexible'materialr Issuingjupwardlp from the-piston are. three studs 9.I. Thesestuds are formed with heads 92 which are imbeddedin bosses 93 formed; integral; with the: said pistons; Overlying each of. the-pistons 89 and-.89E-is 1a fol-1 lower 94 which has a. curved: surface: 95simi lar. to: the surf aces, 90. of the: pistons '88- andiw: The studs 9| pass through the follower 94-and the sheet 63: of: insulated: materiaL. A- screw: 96= s screwed into the. end i of each of the-studs 9-I=and has a washer '91 encircling it which bearseagains-t the end. of. each of said; studs. Inthis manner. the iollowenis maintained in position :withoutn-un-r duly. squeezing the rubber sheet 63:; It will. readily be comprehendedth'a. the: portion of: the: sheet of'rub'ber overlying. the. upper: ends'of the com)- partments 43 and. 44: form. diaphragms. which whentheshaft 14 is rotated flex back and forth to alternately compressan'd-expand the fluid located above them.

In the wall structure 59" of the head 21 are formed two compartments 98- and 99. These compartments overlie the-compartments 43 and 44 and form the compression chambersof the pump.- In. the cap 28 is provided-a partition IBI which divides the space within=said cap into two compartments I02 and I03.. The compartment I92 serves as an inlet chamber." and the compartment I93. as an outlet chamber. Thispartition IDI extends crosswise of. the partition 38 and engages a raised" portion I04"which has a surface I95 forming a continuationof the upper surface 6-2of the head 2-1. The gasket- 69 disposed between the surfaces-62 and 195i and between the corresponding surface 61 of the cap 28 forms a fluid-tight connection therebetween. In the cap 25 is formed a tapped inlet I09 which communicates with the compartment I02. The said cap is further formed with a tapped outlet III) which communicates with the compartment I03.

The wall structure 59 has a top portion I II which is formed with inlet ports H2 and with outlet ports II3. In the compartment 98 is disposed an inlet valve II4 which closes the port I I2 allowing fluid to enter the chamber 99 but preventing the escape of fluid therefrom. An outlet valve I I is located in the compartment I03 and is adapted to close the port I I3 leading to compartment 98. This valve is similar to the valve I I4 in construction. Similar inlet and outlet valves II4 and II 5 are located in the compartment 99 and the compartment I03 and communicate with the compartments I02 and 99 through certain of the ports.

The valves I I4, and H5 are all identical in construction and only one of the valves II4 which has been shown in detail in Fig. 2 will be described in detail. This valve consists of two discs of rubber H8 and H9 which are frusto-conical or dish-shaped in form. These discs are supported on formed backing members I and I2I which smooothly flt the interior of said discs. These backing members are mounted on a sleeve compartment 98.

I22. which. registers= withthe: port I -I 2.. line-said sleeve has openings I23 in. thesame whiohtbring the ports I I2-into communicationwith the space between the backing. members I2Ih and Ill These backing. members-are further spacedafrom one another to. form aslit. 124. therebetween. and through which thhe. liquid: may pass from the port. H2 and into the. compartment 983 The marginalpontions-of the discs H3 and M 9 nonmally engage each other to prevent the-flow otliquid. into the. valvebutreadily yield when-the pressure. is brought intothe valve throughlthe openings I23 and slit I24 to direct-the water into the. compartment 98.. Aretainer I25 engagesrth'e lowermost disc I-I 9atx-thealower part of the-same While a. crowfoot. I26 is seated in an annular groov-e I21: in the wall structure 59 concentric Witt I the port t I2. A bolt I8 passes through the. crowfoot- I26 andtheretaineri I25 and clamps the parts position and holds the valve yat tached to the top portion III: of thelwall' stnuc ture 59. In additionthis bolt clamps the innermost portions of the discs H9 and H9 against thebacking members I29 and I 2-I-. I

The operation of the invention is obvious. he the shaft I4 is driven the'diaphragmsformed-b8; the flexible sheet 53 are flexed above. and below the. normal plane of said sheet. In'thismanncr pressure and suction is alternately ci eated in: the compartments 98 and; 99: When pressure: is created in compartment98 the discs l lfl an'di N9 of valve H4 are squeezed togetherand nofluid escapes through the valve. However, thefluidis forced through the port I;-I3;and into-the interli'on' of valve H5. This causes the: marginal portions of the discs II&- and H9 tdspread: apart. and the fluid enters the outlet compartment M31 The fluid is led from:thiscompartmentby anyrsuitiable means connected to the outlet. IIIl... When the compartment 98 is" under suction the re! verse occurs. Valve I I s: new remainsclosed'vand fluid may be drawn in through-the port I IZ an'd into the interior of: thevalve I M where it escapes between the discs. H8 and. H9 and enters". the

The advantages of the invention are manifest. The device is extremely simple in construction and foolproof in operation. By the use of the plastic body and head, machining of the surfaces contacting the sheet of rubber is eliminated thereby permitting of manufacturing the pump with a minimum amount of machining. The parts are held together by means of four bolts and whenever the sheet of flexible material wears the parts can be taken apart and a new sheet readily substituted. By means of the type of valve used, grains of sand may readily pass through the same without injuring the valve. Hence the entire pump will operate for an extremely long period of time without attention. Both of the bearings for the crank shaft are mounted in the base independently of the body or head. Thus the machining for the bearings becomes exceedingly simple and correct alignment of the balls receiving the ball bearing races may be procured without eflort. The sheet of flexible material as well as formin diaphragms for the pump form a gasket sealing the head 21 and body 26. My improved pump by utilizing the ovularshaped pistons and piston chambers becomes exceedingly compact and utilizes a minimum amount of material.

Changes in the specific form of my invention, as herein described, may be made within the scope of what is claimed without departing from the spirit of my invention.

Having described my invention, what I claim as new and desire to protect by Letters Patent is: 1. In a pump a body having a lateral wall structure forming a chamber therein open at the top, a partition in said body dividing said chamber into two compartments elongated in form, said wall structure and partition being curved at the ends of said compartments to make said compartments ovular in cross section, a piston in each ofsaid compartments ovular in form, a head overlying said body and formed with a lateral wall structure and having portions disposed opposite the ends of the'wall structure and partition of said body and forming two pressure compartments disposed above the first named compartments, a sheet of flexible material disposed between said head and body and engaging the ends of said wall structure and partition and said portions of the head and forming diaphragms for said pistons and a gasket between said body and head, a cap overlying said head and forming a space between said cap and said head, means on said cap and head forming a partition extending transversely of the partition in said body and dividing the space between said head and cap into an inlet compartment and an outlet compartment, outlet valves carried by the lateral Wall structure of said head and disposed in said outlet compartment one on each side of said first named partition and bringing said respective pressure compartments into communication with said outlet compartment, inlet valves carried by the lateral wall structure and disposed on the side of said last named partition opposite said outlet valves and disposed one on each side 01" said first named partition and bringing said inlet compartment into communication with the respective pressure compartments and means carried by the body and connected to said pistons for reciproeating said pistons.

2. In a pump a body, a head carried by said body and having a lateral Wall structure and a partition extending across the same and forming ,7 8 therein two juxtaposed elongated pressure compartments open at the bottom, flexible sheet like means clamped between said head and body and closing said compartments, and forming diaphragms, piston underlying said diaphragms, means carried by's'aid body and connected to said pistons for reciprocating said pistons, followers overlying said diaphragms and secured to said piston, said followers being elongated in form and conforming in configuration to the configuration of said compartments, a cap overlying said head and forming a space therebetween, means forming a partition between said head and cap and extending transversely of the partition in said head, and dividing'said space between said head and cap into an inlet compartment and an outlet compartment, outlet valves carried by said head and disposed in said outlet compartment one on each side of the partition in said head, and bringing the outlet compartment into communication with the respective pressure compartments, and inlet valves carried by the head and disposed on the side of said partition in said cap opposite said outlet valves and disposed in said pressure compartments and one on each side of the partition in said head, and bringing said inlet compartment into communication with the respective pressure compartments.

RICHARD T. CORNELIUS. 

